Gotowe bibliografie tematyczne / Gold ores

Gotowa bibliografia na temat „Gold ores”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 31 lipca 2024

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Artykuły w czasopismach na temat "Gold ores"

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Vaughan, J. P., i A. Kyin. "Refractory gold ores in Archaean greenstones,Western Australia: mineralogy, gold paragenesis, metallurgical characterization and classification". Mineralogical Magazine 68, nr 2 (kwiecień 2004): 255–77. http://dx.doi.org/10.1180/0026461046820186.

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AbstractMesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite ± arsenopyrite ± pyrrhotite sulphide assemblage. Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling. The most common sulphide ore types can be sub-divided broadly into pyritic (pyrite±pyrrhotite) and arsenical types (pyrite+arsenopyrite± pyrrhotite). Arsenical ores vary from highly refractory to free-milling. Arsenopyrite in highly refractory ores is finer grained, As-deficient (27 –32.5 at.% As), contains high average concentrations of submicroscopic gold (60 –270 ppm), but does not contain inclusions of particulate gold. Arsenopyrite in free-milling ores is coarser grained, less As-deficient to slightly As-rich (30 –35 at.% As), contains low or negligible concentrations of submicroscopic gold, but contains inclusions and fracture fillings of particulate gold. In some refractory arsenical ores, pyrite also contains moderately high levels of submicroscopic gold (20 –40 ppm), the concentration of which is directly related to As content of the pyrite.Pyritic ores are free-milling to mildly refractory, or rarely moderately refractory. Pyrite in pyritic ores contains negligible to low levels of submicroscopic gold (<5 ppm). Other reasons for refractory behaviour in pyritic ores include very fine-grained native gold inclusions in pyrite, or the presence of gold-bearing tellurides.It is concluded that submicroscopic gold is incorporated into the crystal lattices of arsenopyite and arsenical pyrite at sub-greenschist to lower greenschist-facies temperatures, and is progressively expelled as inclusions and fracture fillings of native gold in sulphides, and ultimately into the gangue, as recrystallization proceeds through upper greenschist- into amphibolite-facies temperatures, during deformation and burial. Submicroscopic gold is expelled more rapidly from pyrite than arsenopyrite.Pyrrhotite progressively replaces primary pyrite at higher temperatures, but rarely contains gold. Finally, a metallurgical classification scheme for refractory ores is presented which incorporates the above mineralogical conclusions.
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DVORNIK, Gennadiy Petrovich. "Conformities distribution contents gold and silver in ore bodies of the Berezovskoe deposit (Middle Urals)". NEWS of the Ural State Mining University, nr 4 (15.12.2023): 55–68. http://dx.doi.org/10.21440/2307-2091-2023-4-55-68.

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The relevance of the work is due to the importance industrial meaning associated with beresits and listvenites gold ores deposit in the world production. Purpose of the work – study conformities of distribution gold and silver concentration in ore bodies of the Berezovskoe deposit. Methods of research included separation industrial types of ores for valuation quality gold chute, use probabilistic-statistic, geometric-statistic and geostatistic models for description amplitude and frequency changeability gold and silver content in ore bodies of Berezovskoe deposit. Results. It was established definite conformities in distribution contents gold and silver in primary types ores of Berezovskoe deposit. So in limits mineralized dikes granitoids on percentage correlation rich, ordinary and poor ores, meaning coefficients wealth and the gold-silver ratio the best quality distiquished sulphide-quartz ores in the strip veins in comparison with more poor impregnation ores in berezites near veins. In distribution parameters gold mineralization (contents gold and silver, linear productivity of ores) was established tier vertical zonality with separation 2–3 levels the largest foul prevalence mineralization on dip dikes granitoids in interval of depth 112–712 meters. In distribution contents gold and silver in ores registered lateral zonality on strike ore-bearing dikes granitoids. She expressed in conforming growth productivity of ores on horizons with moving off in direction with south to the north from the contact Shartash massif of granitoids. Distribution gold and silver content in mineralized dikes granitoids on amplitude variability changed from quite uneven to extremely uneven. Among colour sulphide-quartz veins of Berezovskoe deposit on content in their gold and silver, linear productivity of ores the best quality defined veins, formed on upper ore level (53–168 m). Quality ores conforming lowered with growth of depth bedding veins on middle ore level (201–262 m) and lower ore level (442–512 m) horizons.
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Abramov, B. N. "Peculiarities of the distribution of rare-earth elements in the ores of some gold deposits of Eastern Transbaikalia". Proceedings of higher educational establishments. Geology and Exploration, nr 5 (2.11.2018): 48–58. http://dx.doi.org/10.32454/0016-7762-2018-5-48-58.

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The distribution of rare-earth elements (REE) in ores of gold deposits of East Transbaikalia has shown that the ore-bearing magma chambers have different depths and degrees of differentiation. The greatest degree of differentiation was within the magmatic foci (Eu/Eu* — 0,29—0,32; Rb/Sr — 0,98—1,40), which are the sources of gold-quartz-arsenopyrite ores, the magmatic sources of the gold-quartz and gold-sulfide-quartz ores (Eu/Eu* — 0,53—0,72; Rb/Sr of 0,10 to 0,54) had lesser degree of differentiation. Magma chambers that are sources for the gold-quartz-arsenopyrite ores (Eu/Sm — 0,08—0,14), were at shallower depths than those for gold-quartz and gold-sulfide-quartz ores (Eu/Sm — 0,11—0,19). The formation of gold-quartz-arsenopyrite ores took place at the magma chambers, largely enriched in volatile components, it is indicated by the existence of a significant tetrad effects in REE patterns of (T1-4 - 0,80; 1,15; 1,16).
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Keedy, C. R., L. Parson i J. Shen. "Determination of gold in gold ores". Journal of Radioanalytical and Nuclear Chemistry Letters 137, nr 3 (październik 1989): 191–99. http://dx.doi.org/10.1007/bf02167774.

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Amdur, A. M., R. A. Apakashev, S. Ya Davydov i N. G. Valiev. "The extraction of the associated precious metals out of the construction industry's complex ores". NOVYE OGNEUPORY (NEW REFRACTORIES), nr 8 (27.12.2018): 20–23. http://dx.doi.org/10.17073/1683-4518-2018-8-20-23.

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The effective processing methods were investigated for the precious associated components extraction out of the ores by means of the physical and chemical and the chemical and metallurgical enrichment integration. It was established experimentally that the gold's disperse drops melted by means of the external heat source moved to the ore's surface through the pores under the thermocapillary pressure influence. After the enclosing rocks melted the gold drops were floated by the gas bubbles. The pyrometallurgical device was developed to extract the dispersive gold out of the complex ores in the course of the cast refractory materials processing.Ill.3. Ref. 5.
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Bulaev, Aleksander, Zylikha K. Kanayeva, Maxim I. Muravyov, Ashimkhan T. Kanayev i Tamara F. Kondrat'eva. "Column Bioleaching of Refractory Gold Ores". Advanced Materials Research 1130 (listopad 2015): 459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.459.

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Refractory sulfide ores are ubiquitous resources of gold around the world. It was demonstrated that biooxidation pretreatment of refractory whole ores could be conducted in heaps. The effectiveness of column biooxidation of off-balance gold ores from Bakyrchik and Bolshevik deposits (northeast Kazakhstan) containing pyrite and arsenopyrite was examined in the laboratory. Bakyrchick ore contained 1.5% of pyrite, 3% of arsenopyrite and 4.5 g/t of gold. Bolshevik ore contained 1% of pyrite, 1% of arsenopyrite and 10.7 g/t of gold. The recovery rates of gold from the Bakyrchik and Bolshevik ores by direct cyanidation were 4.5% and 8.2%, respectively. Representative samples of each ore were processed in air-lift percolators. A bioleaching experiment was performed in duplicate. The enrichment culture was obtained from the pyrite flotation wastes and used as an inoculum. Bioleaching was conducted for 60 days at ambient temperature (20-25°C). The recovery rates of gold from the bioleaching residues of Bakyrchik and Bolshevik ores by cyanidation were 21.0% and 48.5%, respectively. The results obtained in the present work may be used to estimate perspectives of heap bio-oxidation for the recovery of gold from these sulfide ores.
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Razmakhnin, KK, i PA Vasiljuk. "Technological and environmental features of heap leaching of Delmachik gold-bearing ores deposit". IOP Conference Series: Earth and Environmental Science 991, nr 1 (1.02.2022): 012044. http://dx.doi.org/10.1088/1755-1315/991/1/012044.

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Abstract The problem of gold ores hydrometallurgical processing with using sodium cyanide is evaluated. The prospects for the development of the use of cyanide-free reagents for leaching gold from ores are studied. The possibility of introducing a cyanide-free environmentally friendly reagent instead of the widely used sodium cyanide was determined. The results of experimental studies on the comparability of the processing of gold ores using sodium cyanide and a reagent based on sodium cyanoate are obtained. The optimal parameters of the technological process for the extraction of gold from ores using a cyanide-free reagent are established.
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Chen, Bo Wei, Jian Kang Wen i Guo Cheng Yao. "Acidophiles and its Use in Mineral Biomining with Emphasis on China". Advanced Materials Research 926-930 (maj 2014): 4201–4. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.4201.

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Acidophiles have been widely used in heap and dump bioleaching of secondary copper sulfide ores and biooxidation of refractory gold ores. 22 genera of acidophiles have been found in biomining environments. This paper gives a preliminary introduction to the application of mineral biomining in China. Challenges and technical trends for heap bioleaching of primary copper sulfide ores, purification of bioleaching solution of polymetallic sulfide ores and biooxidation of carbonaceous refractory gold ores are also recommended.
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Zalesov, M. V., V. A. Grigoreva, V. S. Trubilov i A. Ya Boduen. "Designing of engineering solutions to enhance efficiency of high-copper gold-bearing ore processing". Mining Industry Journal (Gornay Promishlennost), nr 5/2021 (12.11.2021): 51–56. http://dx.doi.org/10.30686/1609-9192-2021-5-51-56.

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The modern metals industry is characterised by a downward trend in the quality of ores involved in processing, and conventional methods of extracting useful components are inefficient for raw materials with complex composition. To maintain the growing level of metal production it is required to introduce new efficient technologies for processing of low-grade and refractory ores as well as man-made deposits. The article describes processing methods of refractory raw materials with high cyanide content using copper-gold ores as an example, where gold is the primary commodity, and copper is the accompanying useful component. The most common method of processing copper-gold ores is preconcentration followed by selective leaching of copper and gold. In some cases, technologies involving copper by-products and cyanide recovery from the cyanide leaching solutions offer equally effective options for processing of the copper-gold ores and concentrates. Copper-gold ores are processed at gold mines using the cyanide procedures, supplemented if required by gravity and flotation concentration. In all variations of the cyanide treatment, most of copper minerals actively react with cyanides of alkali metals, binding the CN– ions into the copper complex of [Cu(CN3)]2–. This reaction results in an increased solvent consumption, as well as in number of challenges related to cleaning tailings and slurries from highly toxic cyanide compounds and dissolved copper. In addition to technological complications associated with the need to meet strict requirements for the maximum permissible concentrations, copper accumulated in the cycling solutions also causes a decrease in gold extraction from the processed ores.
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Vikentyev, Ilya, Olga Vikent’eva, Eugenia Tyukova, Maximilian Nikolsky, Julia Ivanova, Nina Sidorova, Dmitry Tonkacheev i in. "Noble Metal Speciations in Hydrothermal Sulphides". Minerals 11, nr 5 (3.05.2021): 488. http://dx.doi.org/10.3390/min11050488.

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A significant part of the primary gold reserves in the world is contained in sulphide ores, many types of which are refractory in gold processing. The deposits of refractory sulphide ores will be the main potential source of gold production in the future. The refractory gold and silver in sulphide ores can be associated with micro- and nano-sized inclusions of Au and Ag minerals as well as isomorphous, adsorbed and other species of noble metals (NM) not thoroughly investigated. For gold and gold-bearing deposits of the Urals, distribution and forms of NM were studied in base metal sulphides by laser ablation-inductively coupled plasma mass spectrometry and by neutron activation analysis. Composition of arsenopyrite and As-pyrite, proper Au and Ag minerals were identified using electron probe microanalysis. The ratio of various forms of invisible gold—which includes nanoparticles and chemically bound gold—in sulphides is discussed. Observations were also performed on about 120 synthetic crystals of NM-doped sphalerite and greenockite. In VMS ores with increasing metamorphism, CAu and CAg in the major sulphides (sphalerite, chalcopyrite, pyrite) generally decrease. A portion of invisible gold also decreases —from ~65–85% to ~35–60% of the total Au. As a result of recrystallisation of ores, the invisible gold is enlarged and passes into the visible state as native gold, Au-Ag tellurides and sulphides. In the gold deposits of the Urals, the portion of invisible gold is usually <30% of the bulk Au.
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Rozprawy doktorskie na temat "Gold ores"

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Leeming, Prudence Mary. "Turbidite-hosted gold deposits". Thesis, Rhodes University, 1985. http://hdl.handle.net/10962/d1005939.

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Turbidite-hosted gold deposits contribute a significant proportion to world lode gold production and have also provided substantial gold to alluvial resources. Turbidity current deposits occur throughout geological time within Archaean greenstone belts, Proterozoic orogenic belts and rifted passive continental margins, and Palaeozoic geosynclines. Representing the end member of the sedimentary cycle, turbidites have the attribute of preservation not only on an individual bed basis but also due to below wave base accumulation in submarine deeps. Cyclic deposition according to the Bouma sequence punctuates turbidite deposition by a series of diastems. Accumulation of organic, pelagic and chemical sediments may concentrate gold to protore enrichment levels i n a primary sedimentary environment. Dewatering during diagenesis and low-grade metamorphism under reducing conditions may redistribute gold with transport as low energy organo- and thio-complexes. Gold may precipitate with diagenetic pyrite and silica near black shale and/or partially replace fine carbonate detritus. Gold solubility increases with high grade amphibolite facies metamorphism (T 400ºC) when efficient leaching of gold and transport by simple chloro- and hydroxychloro - complexes to lower greenschist regions takes place. Reduced permeability of turbidite strata induces hydrofracturing which focuses dewatering solutions. Gold is deposited due to pressure and temperature decrease or local changes in physico - chemico conditions caused by the reaction of fluids with wall rocks (reactive beds in turbidites are predominantly carbonaceous strata). The largest of turbidite - hosted goldfields are confined to back -arc or marginal sea basins with restricted oceanic circulation. The richest concentrations of gold occur proximal to the original source within the greenschist facies formations lowermost in a thick turbidite sequence and exhibit strong combined structural and lithological association. Turbidites represent important strata for the concentration and preservation of gold not only during sedimentation and diagenesis but also during later deformation and metamorphism.
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Slabbert, W. L. "Ore distribution controls of the Navachab Gold Mine, Damara Belt, Karibib District, Namibia". Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1016364.

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The Navachab Gold mine, an orogenic lode gold deposit, is located in the Karibib region of the Pan-African (ca. 550-500) Damara belt of central Namibia. Gold mineralisation is developed within the steeply NW dipping limb of the Karibib dome. Here, ore envelopes trend along three main orientations: a) trends shallowly towards the NE (the down plunge extent), b) trends sub-vertically in and along the down plunge extent and c) trends sub-horizontally across the down plunge extent. The down plunge extent represents the bulk of the gold mineralisation, hosting the only high grade ores mined at Navachab. As such, past work primarily focused on establishing the controls to the mineralisation observed here. The sub-vertical and sub–horizontal ore trends are seen as secondary, lower grade, being hosted in the footwall. By cutting pushbacks into the footwall, in an effort to regain access to high grade pit bottom, future gold production almost exclusively relies upon optimally mining these ores. This underlines the importance to investigate and outline the mineralising controls to the secondary ore trends. This study identified the following prevailing quartz vein sets developed within the footwall, set (1) dips shallowly towards the NE (conjugate vein set), (2) steeply towards the NW (bedding parallel veins) and (3) steeply towards the SE (S2 foliation parallel). The NW and SE dipping sets contain high average gold grades, occurring at an infrequent vein density. The NE dipping veins, as a result of occurrence density alone, was highlighted as the dominant gold hosting set. Veining occurred during the late stages of the NW-SE directed, sub-horizontal shortening (D2) event and is associated with top-to-the-NW thrusting and NW-verging folds. Re-Os molybdenite dating from auriferous quartz veins indicates mineralisation occurred at 525-520 Ma. As crustal shortening amplified the Karibib dome, flexural flow developed fractures along bedding planes, providing the control to bedding parallel veins (NW dipping). With continued crustal compression the dome later experienced fold lock up associated with reduced mean rock stress and sub-horizontal extension occurred along the steeply NW dipping limb. Horizontal extensional gashes sucked in fluids to form the shallowly NE dipping conjugate vein set. These features suggest the regional D2 strain as the first-order control to quartz vein development, down plunge and within the footwall ores. To further define the secondary ores, lithological and structural controls were evaluated on a more detailed local scale. With equal amounts of biotite schist and calc-silicate host rock (bulk of the footwall lithology) material analysed, the biotite schist units were found to contain a larger volume amount of quartz veins. The mineralisation incurred is also developed at higher average gold grades compared to that of the calc-silicates, demonstrating biotite schist having the optimal rheology for quartz vein emplacement. Normal faulting and thrusting occurs widespread, at all scale levels, across the footwall. These were primarily observed along bedding foliations and secondly at higher angles cutting across foliation. The study did not constrain the extent of these, but can conclude faulting plays a very prominent role in re-distributing the secondary ores parallel to bedding along sub-vertical trend planes. Great care should be placed in properly modelling these with 3D software such as Leapfrog. The Navachab gold mineralisation came about as a result of convergent and collisional tectonics activating metamorphic dehydration of the crustal metapelites. As these fluids ascended they absorbed gold from the crust, emplaced by either a magmatic or paleo-placer source. The gold enriched hydrothermal fluids amalgamated in large scale 1ste order structures (shearing of the steep NW limb of the Karibib Dome, the Mon Repos Thrust Zone) that acted as primary active fluid path ways. In the case of Navachab the gold enriched fluid fluxed along these pathways while interacting with fluid sinks related to a physical throttle (brittle schist, folding, bedding parallel shears) and/or a chemical trap (marbles). By summarising and detailing the fluid sinks and active fluid pathways identified by this and previous works, it is strongly recommended that a mineral approach system be designed and implemented as targeting model to lead future exploration endeavours.
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Van, den Berg Rudolf. "Inhibition of the pregrobbing phenomenon in gold ores". Thesis, Cape Technikon, 2000. http://hdl.handle.net/20.500.11838/907.

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Thesis (MTech (Chemical Engineering))--Cape Technikon, Cape Town, 2000
In a typical gold-recovery plant, it is estimated that a substantial amount of the gold in residues may be in the form that is recoverable by cyanidation. The gold in residues can be ascribed broadly to (l) the presence of cyanicides, which consume the cyanide radical and thus inhibit dissolution of gold, (2) refractory gold resulting from coatings on some gold particles, (3) large gold particles incompletely dissolved due to inadequate contact time, (4) unliberated gold as a result of too coarse a milled product, and (5) gold dissolved during leaching, then adsorbed by other minerals or by carbonaceous matter in the pulp. This study focuses on the latter, where dissolved gold is pregrobbed during leaching by adsorbent materials in the ore. The term pregrobbing refers to the active adsorption ofgold from cyanide pregnant solutions by components ofthe ore. It has been suggested that gold already dissolved by cyanide may be adsorbed by other minerals and by carbonaceous matter in the pulp. The presence ofcarbonaceous matter in gold ores presents a two-fold problem namely, the poor release of gold from the carbonaceous matrix and the uptake of dissolved gold by the carbonaceous leach residues. Studies by several other investigators using ores from various parts of the world have similarly shown that the natural carbonaceous matter associated with refractory gold ores often behaves like activated carbon when in contact with aurocyanide solutions. Some debate also exists over the extent to which gold may be adsorbed onto the surfaces of minerals. Different authors have identified that minerals such as' pyrite, copper sulphides, quartz and layered silicates, such as kaolin, phlogopite and ilIite exhibit gold adsorbing properties. Activated carbon was first used as a model pregrobber in batch kinetic adsorption experiments in the presence of a gold selective strong base anion-exchange resin.
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Whitfield, Derek. "The genesis and controls of gold mineralization south of Rehoboth, Namibia". Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005560.

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Gold mineralization is hosted within gossanous quartz-haematite veins in volcano-sedimentary lithologies of the Klein Aub - Rehoboth basin of the Irumide Belt, Namibia. Mineralization and hydrothermal alteration are restricted to deformed lithologies particularly the metasediments. Lithological relationships, geochemistry and metallogenic characteristics of the Irumide Belt suggest an intra-continental rift setting. Copper mineralization is well known along the length of the belt, from Klein Aub in the southwest to Ghanzi in the northeast, whereas gold mineralization appears restricted to the Klein Aub Rehoboth basin. The gold is envisaged as having being leached initially from graben fill sequences during rift closure and basin dewatering. Location of the mineralization is strongly controlled by structure and lithological contact zones. Such zones are percieved as having acted as conduit zones for escaping mineralized fluids during basin closure and deformation. Apart from the lack of an effective mineralizing trap, all features consistent with the development of an ore deposit are present. The largest mineralization traps within the area studied are shear zones followed by lithological contact zones. The Mebi and Blanks gold mines are developed over large shear zones while the Swartmodder and Neuras gold mines are situated over mineralized lithological contacts. The Swartmodder copper mine yielded ore from a mineralized schist enclave within granite. Copper and gold occurrences are attributed to two contrasting styles of mineralization. Copper mineralization is suggested to have developed during initial rifting of the belt (ie. stratabound sedimentary exhalative type), while the gold and minor copper resulted from rift closure and basin dewatering. Although no economical orebody was realized during the course of this study a model is proposed for the development of mineralization within the Irumide basement lithologies as a working hypothesis for future exploration.
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Gendall, Ian Richard. "The porphyry copper system and the precious metal-gold potential". Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005604.

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It has been established that porphyry copper/copper-gold deposits have formed from I Ma to 2 Ga ago. Generally, they are related to the Mesozoic-Cenozoic interval with few reported occurrences from the Palaeozoic or Precambrian. A reason cited is the erosion of these deposits which are often related to convergent plate margins and orogenic belts. Observations of the alteration and mineralisation within and around porphyry copper/copper-gold systems have been included in numerous idealised models. These alteration and mineralisation patterns are dependent on the phases of intrusion, the tectonic setting and rock type, depth of emplacement and relationship to coeval volcanics, physiochemical conditions operative within and surrounding the intrusive and many other mechanical and geochemical conditions. Island arc and cratonic arc/margin deposits are generally considered to be richer in gold than their molybdenum-rich, intra-cratonic counterparts. Metal zonation may occur around these copper/copper-gold deposits, e.g. copper in the core moving out to silver, lead, zinc and gold. This zonation is not always present and gold may occur in the core, intermediate or distal zones. Examples of gold-rich porphyry deposits from British Columbia, Chile and the SW Pacific Island regions suggest gold is closely associated with the potassic-rich zones. Generally these gold-rich zones have greater than 2% magnetite and a high oxygen fugacity is considered to be an important control for gold deposition. High Cl contents within the magma are necessary for gold mobility within the host intrusive centres. Beyond this zone HS₂ becomes an important transporting ligand. Exploration for porphyry copper-gold deposits includes an integrated geological, geophysical and geochemical approach. Petrographic work through to Landsat imagery may be used to determine the chemical conditions of the system, ore association, favourable structural zones and alteration patterns, in order to focus exploration activities.
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Polito, Paul A. "Exploration implications predicted by the distribution of carbon-oxygen-hydrogen gases above and within the Junction gold deposit, Kambalda, Western Australia /". Title page, table of contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09php769.pdf.

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Morasse, Suzanne. "Geology, structure and timing of gold mineralization at the Kiena deposit, Val d'Or, Québec". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/NQ31942.pdf.

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Lack, Barbara Anne. "Electrochemical studies of gold bioaccumulation by yeast cell wall components". Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1004969.

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Gold, amongst other group 11 metals, was almost certainly one of the first three metals known to man. In addition to the economic importance of the metal, gold has a wide variety of applications in the medical, electrocatalytical and micro-electronics fields. However, the determination of gold ions in solution, with accuracy, precision, sensitivity and selectivity is still an interesting and much debated topic in analytical chemistry. A system whereby gold ions have been successfully detected employing an electrochemical technique, known as stripping voltammetry, has been developed. The electrochemical method was chosen over other available techniques for the sensitivity, particularly at low concentrations, and selectivity properties; notably in the presence of other metal ions. Under acidic conditions, the electrochemical technique was applied and the presence of gold(III), at a concentration of 2.53 x 10⁻⁵ mol dm⁻³ in a mine waste water sample, was detected. Biomass, in particular yeast and algal types, have been successfully employed in extracting low concentrations of gold ions from industrial effluents. The manipulation of the biological facility for mineral interaction, biohydrometallurgy, may yield numerous potential new technologies. South Africa in particular would benefit from this area of research, since the country is a major ore and metal refining country and if the output and the efficiency of the mines could be improved, even by a small percentage, the financial rewards would be vast. In this study, the application of adsorptive cathodic stripping voltammetry (AdCSV) of gold(III) in the presence of various Saccharomyces cerevisiae cell wall components, was investigated to determine which, if any, were involved specifically in the chemical binding of the gold ions. The chitin and mannan extracts showed the most promise with detection limits of 1.10 x 10⁻⁶ mol dm⁻³ and 9 x 10⁻⁹ mol dm⁻³, respectively; employing the AdCSV technique. A modification of the stripping voltammetry technique, Osteryoung square wave stripping voltammetry (OSWSV), provided the lowest detection limit, for gold(IIl) in the presence of mannan, of 1.70 x 10⁻¹¹ mol dm⁻³ ; utilising a modified carbon paste electrode. The detection of gold(III) has been shown to be dependent on the type of electrode employed, the electrolyte solution and the presence of interfering agents. The effect of copper(II) and silver(I) on the detection of the gold(III) in solution was investigated; whilst the silver(I) has shown no detrimental effects on gold (III) detection systems, copper(II) has indicated the possibility of forming an inter-metallic compound with the gold(III). However, mannan has shown to selectively and preferentially bind the gold(III) in the presence of a ten-fold excess of copper(II). Nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy, as well as computer modelling techniques were employed to further investIgate the mannan-gold(III) interaction and proposed complex formed. The NMR, IR and computer modelling data are in agreement with the electrochemical data on proposing a mannan-gold(III) complex. The co-ordination site was established to be in the vicinity of the H-I and H-2 protons and the gold(III) adopts a square-planar geometry upon co-ordination. The benefits of the research are useful from a biological perspective (i. e. as more is known about the binding sites, microbiologists/biochemists may work on the optimisation of parameters for these sites or work could be furthered into the enhanced expression of the sites) and an industrial one. In addition to the' two major benefits, an improved understanding of gold and its chemistry would be achieved, which is advantageous for other fields of research as well.
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BRAVO, SARA VIRGINIA CHUMPITAZ. "STUDY OF THE PROCESSING OF SULPHIDE ORES OF GOLD WITH THE LOWEST GRADE OF GOLD". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3947@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
No presente trabalho são avaliados os fatores físicos e químicos que influenciam o processamento do minério sulfetado de mais baixo teor de ouro conhecido no mundo. A amostra de minério estudada é proveniente da Rio Paracatu Mineração S.A - RPM e é identificada como minério Calha Brava Cl-4, pertencente ao Banco 716, Bloco 508-B da mina. Alguns circuitos de beneficiamento de minérios auríferos incluem processos de concentração gravítica e flotação visando atingir máximas recuperações de ouro e, conseqüentemente, elevada produção a baixo custo. A seleção das técnicas de processamento do minério depende, basicamente, da mineralogia e distribuição das partículas minerais no minério, do tamanho da partícula de ouro ou dos minerais e outros metais associados ao minério. A distribuição do teor de ouro nas diferentes frações granulométricas do minério Calha Brava Cl-4 revelam que 80,4 por cento do ouro encontra-se na fração acima de 104 um e 25 por cento encontram-se na fração fina (< 28 um). A recuperação total de ouro, enxofre e arsênio obtida nos ensaios de concentração gravítica por meio do concentrador centrífugo Knelson e flotação foram 80,44 por cento, 64,9 por cento e 58,22 por cento, respectivamente. A recuperação em massa dessa etapa foi 10,14 por cento. A recuperação total de ouro, enxofre e arsênio obtidos na concentração de jigagem e flotação foi 88,91 por cento, 86,82 por cento e 49,07 por cento, respectivamente. A recuperação em massa do concentrado recuperado foi de 19,5 por cento. Nos ensaios de flotação direta, a maior recuperação de ouro (87 por cento) foi obtida para o minério cominuído a uma granulometria com P80 = 86 um e recuperado por flotação na presença de 30 g/t do coletor amil xantato de potássio (AXP), 20 g/t de metil isobutil carbinol (MIBC), pH 6,3 e potencial de polpa 0,209 V vs Eh, em relação ao eletrodo de hidrogênio. A recuperação em massa do concentrado obtida foi 4 por cento. No caso das partículas grossas do minério (P80 = 130 um), constatou-se a necessidade de maiores concentrações do coletor. A maior recuperação de ouro (85,33 por cento) foi obtida com a concentração de 60 g/t para o AXP, pH 6,3 e potencial de polpa de 0,218 V vs Eh. A recuperação em massa do concentrado foi de 9 por cento.
The work involves the evaluation of physical and chemical factors that influence the processing of sulphide ores, with the lowest grade of gold known in the world. The studied sample is from Rio Paracatu Mining S.A. and is described as Calha Brava Cl-4, belonging to the 716 bench, block 508-B in the mine. Some industrial processing of gold include gravity concentration and flotation processes in order to reach the maximum gold recovery, aiming at raising production levels with lower costs. The selection of the mineral processing depends on several factors as mineralogy, particle size distribution and other minerals associated with the ore. The distribution of gold grades to the different size fractions in the studied ore, reveals that 80.48 percent of gold occur in the particle size fraction above 104 um, and 25 percent of gold occur in the fine fraction (< 28 um). The global gold, sulphur and arsenic recoveries, obtained by centrifuge gravity concentration (Knelson)and flotation tests, were 80.44 percent, 64.90 percent and 58.22 percent, respectively. To these processes, the mass recovery was 10.14 percent. The total gold, sulphur and arsenic recoveries obtained in concentration processes by jig and flotation techniques were 88.91 percent, 86.82 percent and 49.07 percent, respectively. The mass recovery was 19.5 percent. In the flotation tests, the maximum gold recovery (87 percent) was obtained with the grounded ore (P80 = 86 um), using 30 g/t collector potassium amyl xanthate (PAX), 20 g/t methyl isobuthyl carbinol (MIBC), pH = 6.3 and potential of pulp 0.209 V vs Eh. The mass recovery was approximately 4 percent. When coarse particles (P80 = 130 um) were floated, the need of am increase in the collector concentration was observed. The maximum ore recovery (85.33 percent) was obtained at concentration of 60 g/t PAX, pH = 6.3 and potential of pulp 0.218 V vs Eh. The mass recovery was 9 percent.
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Feldmann, Robert Max Werner. "Use of low concentrations of hydrogen peroxide in extracting gold from metallurgically complex gold ores". Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/1826.

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The study was to understand the fundamentals of benefits hydrogen peroxide has shown in cyanide leaching of complex, gold bearing ores. The understanding was gathered by a comprehensive literature review followed by laboratory experiments including leach experiments, electrochemical studies, several analytical methodologies and statistical data analysis.
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Książki na temat "Gold ores"

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1923-, Tooker Edwin Wilson, red. Gold in porphyry copper systems. [Washington D.C.]: U.S. G.P.O., 1990.

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Thomson, Margaret Lee. The Crixas gold deposit, Brazil: Metamorphism, metasomatism and gold mineralization. London, Ont: Faculty of Graduate Studies, University of Western Ontario, 1987.

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Elevatorski, Edward A. Gold-silver bulk-tonnage deposits. Fallbrook, Ca., U.S.A: Minobras, 1987.

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Petr, Morávek, red. Gold deposits in Bohemia. Wyd. 2. Prague: Czech Geological Survey, 1996.

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Berger, Vladimir Iosifovich. Descriptive, and grade and tonnage model for gold-antimony deposits. [Menlo Park, Calif.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Berger, Vladimir Iosifovich. Descriptive, and grade and tonnage model for gold-antimony deposits. [Menlo Park, Calif.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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͡IAnishevskiĭ, E. V. Osnovnye faktory lokaliza͡tsii zolotogo orudeneni͡ia Muruntauskogo rudnogo pol͡ia. Moskva: In-t mineralogii, geokhimii i kristallokhimii redkikh ėlementov, 1991.

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Richard, Kyle, i Crowe Douglas E, red. Selected mineral deposits of the Gulf Coast and Southeastern United States: Guidebook prepared for the Society of Economic Geologists field conferences, I. 4-5 November 1995, II. 9-11 November 1995. Littleton, CO: Society of Economic Geologists, 1995.

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Symposium at GOLDTech (4th 1990 Reno, Nev.). Advances in gold and silver processing: Proceedings of the Symposium at GOLDTech 4, Reno, Nevada, September 10-12, 1990. Redaktorzy Fuerstenau Maurice C i Hendrix James L. Littleton, Colo: Society for Mining, Metallurgy, and Exploration, 1990.

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1940-, Ashley Roger P., i Geological Survey (U.S.), red. Epithermal gold deposits. Washington: U.S. G.P.O., 1990.

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Części książek na temat "Gold ores"

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Yannopoulos, J. C. "Gold Ores". W The Extractive Metallurgy of Gold, 1–10. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8425-0_1.

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Yannopoulos, J. C. "Cyanidation of Gold Ores". W The Extractive Metallurgy of Gold, 141–70. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8425-0_8.

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Yannopoulos, J. C. "Milling of Amenable Gold Ores". W The Extractive Metallurgy of Gold, 55–77. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8425-0_4.

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Yannopoulos, J. C. "Treatment of Refractory Gold Ores". W The Extractive Metallurgy of Gold, 79–114. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8425-0_5.

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Yannopoulos, J. C. "Leaching Low-Grade Gold Ores". W The Extractive Metallurgy of Gold, 115–36. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-8425-0_6.

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Lottermoser, Bernd. "Cyanidation Wastes of Gold-Silver Ores". W Mine Wastes, 171–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05133-7_5.

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Lakshmanan, V. I., A. Ojaghi i B. Gorain. "Beneficiation of Gold and Silver Ores". W Innovations and Breakthroughs in the Gold and Silver Industries, 49–77. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32549-7_4.

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Lottermoser, Bernd G. "Cyanidation Wastes of Gold-Silver Ores". W Mine Wastes, 243–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12419-8_5.

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Logan, Thomas C., Thom Seal i James A. Brierley. "Whole-Ore Heap Biooxidation of Sulfidic Gold-Bearing Ores". W Biomining, 113–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-34911-2_6.

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Gasparrini, Claudia. "Methods and Techniques for the Study of Ores". W Gold and Other Precious Metals, 45–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77184-2_5.

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Streszczenia konferencji na temat "Gold ores"

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Grigoreva, V. A. "SPECIFIC ASPECTS OF GOLD EXTRACTION FROM PYRRHOTITE-CONTAINING MATERIALS". W XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.92-106.

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Cyanidation is still one of the most common ways to extract gold, despite stricter environmental standards. About 25% of all gold in the world is represented by persistent ores (difficult to cyanidation) (Figure 1), including goldsulfide ores with a high sulfur content. The search for a profitable method of processing gold-bearing ores is associated with study the composition of ore, the forms of finding useful components, as well as the influence of impurity elements on the process of direct extraction of gold, or ore enrichment.
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Anohin, R. R., i S. I. Lyakh. "STUDY OF TECHNOLOGICAL PROCESSES OF PROCESSING GOLD-URANIUM ORES". W XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.125-139.

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There are significant reserves of golduranium ores in Russia and the world, which are of particular interest due to the possibility of simultaneous mining of gold, as the main valuable component, and uranium, as an accompanying one. Due to the differences in the forms of gold and uranium in the ore, as well as their chemical and physical properties, there is a need to develop an integrated technology for processing ores. So, for example, uranium is most often in the oxide form and is quite easily opened in sulfuric acid and carbonate solutions. Gold is present both in a free form, which can be leached with cyanide solutions, and in a refractory form, which requires additional operations to obtain satisfactory opening results.
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Tumakov, V. M., V. V. Maksimenko, D. Yu Kaleda, I. A. Proskuryakova i A. A. Ekimenko. "SPECIFICS OF GOLD EXTRACTION FROM HIGH-ZINC OXIDIZED ORES". W XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.107-108.

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Shi, Shengchun, Bo Yang, Xian Xie, Meicun Zhou i Jianming Xue. "Technological Mineralogy of a Refractory Gold Ores". W International Conference on Materials Engineering and Information Technology Applications (MEITA 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/meita-15.2015.138.

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Maksimenko, V. V., I. A. Proskuryakova, S. A. Antropov, S. S. Orlov i S. S. Minikh. "SPECIFICS OF PROCESSING HIGH-TELLURIUM GOLD ORES". W XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.89-91.

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Tellurium-bearing gold ore is an important type of refractory material. Its specifics are driven by its limited occurrence in nature and the need for special processing methods. According to the classification provided by V.V. Lodeyshchikov, this material is a type C refractory ore containing impurities causing chemical gold depression during cyanide leaching.
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Tomus, Nicolae, Marius Zlagnean i Ioana-Carmen Popescu (Hostuc). "THE GOLD RECOVERY CLEAN TECHNOLOGY FROM REFRACTORY GOLD ORES USING MICROWAVES’ ENERGY". W International Symposium "The Environment and the Industry". National Research and Development Institute for Industrial Ecology, 2018. http://dx.doi.org/10.21698/simi.2018.ab18.

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Dvornik, G. P., i E. V. Imamutdinov. "DISTRIBUTION GOLD AND SILVER CONTENT IN THE ORES ANDREEVSKOY AND IL’INSKOY MINERALIZED DIKES GRANITOIDS BEREZOVSKOGO DEPOSIT". W Проблемы минералогии, петрографии и металлогении. Научные чтения памяти П. Н. Чирвинского. ПЕРМСКИЙ ГОСУДАРСТВЕННЫЙ НАЦИОНАЛЬНЫЙ ИССЛЕДОВАТЕЛЬСКИЙ УНИВЕРСИТЕТ, 2022. http://dx.doi.org/10.17072/chirvinsky.2022.55.

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Gold mineralization Berezovskogo deposit presented sulfide-quartz ores in the land veins and disseminated ores in border their zone berezites in mineralized dikes granitoids. In the Andreevskoy and Il’inskoy dikes deposit defined qualitg basic types of ores and tier vertical zoning in distribution gold mineralization in the dikes in the intervals of depth from 112-712 metres. In operation blocks deposit researched amplitude and frequency changenability in distribution gold and silver content in ores and their correlative connections
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Ghiani, M., A. Serci, R. Peretti i A. Zucca. "Beneficiation of gold sulphide ores from South Sardinia, Italy". W The 8th International Mineral Processing Symposium. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.4324/9780203747117-59.

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Coveney, Raymond M. "THE BONANZA GOLD ORES OF THE ALLEGHANY DISTRICT, CALIFORNIA". W GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-332040.

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Sasaki, Keiko. "Enzymatic pretreatment of carbonaceous refractory gold ores prior to cyanidation". W Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.14128.

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Raporty organizacyjne na temat "Gold ores"

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Steger, H. F., i W. S. Bowman. Ch-1 and ch-2: certified reference gold ores. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/307256.

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Jonasson, I. R., O. R. Eckstrand i D. H. Watkinson. Preliminary Investigations of the Abundance of Platinum, Palladium and Gold in Some Samples of Canadian Copper - Nickel Ores. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122476.

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Harris, Michael J. Column leach testing of gold ore from the Ortiz gold mine--The effect of surfactant additions to the leaching solution. New Mexico Bureau of Geology and Mineral Resources, 1987. http://dx.doi.org/10.58799/ofr-307.

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Grunsky, E. C., B. Dubé, S. Hagemann i C. W. Brauhart. A global database of gold deposits: quantification of multi-element ore signatures. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296647.

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Abramov, B. N. Petrography, conditions formations granitoids amujikano- Shahtaminskogo complex (j2-3) in ore fields gold ore and molybdenum deposits Eastern Transbaikalia. ГеоДозор (Москва), 2018. http://dx.doi.org/10.18411/2223-0831-2018-1-35-43.

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Neyedley, K., J. J. Hanley, P. Mercier-Langevin i M. Fayek. Ore mineralogy, pyrite chemistry, and S isotope systematics of magmatic-hydrothermal Au mineralization associated with the Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328985.

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The Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec. The MIC is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate genetic links between deposits and the MIC, mineralized samples from two of the epizonal 'intrusion-related' Au-Cu vein systems (Doyon and Grand Duc Au-Cu) have been characterized using a variety of analytical techniques. Preliminary results indicate gold (as electrum) from both deposits occurs relatively late in the systems as it is primarily observed along fractures in pyrite and gangue minerals. At Grand Duc gold appears to have formed syn- to post-crystallization relative to base metal sulphides (e.g. chalcopyrite, sphalerite, pyrrhotite), whereas base metal sulphides at Doyon are relatively rare. The accessory ore mineral assemblage at Doyon is relatively simple compared to Grand Duc, consisting of petzite (Ag3AuTe2), calaverite (AuTe2), and hessite (Ag2Te), while accessory ore minerals at Grand Duc are comprised of tellurobismuthite (Bi2Te3), volynskite (AgBiTe2), native Te, tsumoite (BiTe) or tetradymite (Bi2Te2S), altaite (PbTe), petzite, calaverite, and hessite. Pyrite trace element distribution maps from representative pyrite grains from Doyon and Grand Duc were collected and confirm petrographic observations that Au occurs relatively late. Pyrite from Doyon appears to have been initially trace-element poor, then became enriched in As, followed by the ore metal stage consisting of Au-Ag-Te-Bi-Pb-Cu enrichment and lastly a Co-Ni-Se(?) stage enrichment. Grand Duc pyrite is more complex with initial enrichments in Co-Se-As (Stage 1) followed by an increase in As-Co(?) concentrations (Stage 2). The ore metal stage (Stage 3) is indicated by another increase in As coupled with Au-Ag-Bi-Te-Sb-Pb-Ni-Cu-Zn-Sn-Cd-In enrichment. The final stage of pyrite growth (Stage 4) is represented by the same element assemblage as Stage 3 but at lower concentrations. Preliminary sulphur isotope data from Grand Duc indicates pyrite, pyrrhotite, and chalcopyrite all have similar delta-34S values (~1.5 � 1 permille) with no core-to-rim variations. Pyrite from Doyon has slightly higher delta-34S values (~2.5 � 1 permille) compared to Grand Duc but similarly does not show much core-to-rim variation. At Grand Duc, the occurrence of Au concentrating along the rim of pyrite grains and associated with an enrichment in As and other metals (Sb-Ag-Bi-Te) shares similarities with porphyry and epithermal deposits, and the overall metal association of Au with Te and Bi is a hallmark of other intrusion-related gold systems. The occurrence of the ore metal-rich rims on pyrite from Grand Duc could be related to fluid boiling which results in the destabilization of gold-bearing aqueous complexes. Pyrite from Doyon does not show this inferred boiling texture but shares characteristics of dissolution-reprecipitation processes, where metals in the pyrite lattice are dissolved and then reconcentrated into discrete mineral phases that commonly precipitate in voids and fractures created during pyrite dissolution.
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Lauzon, M. C., P. Mercier-Langevin, M. Valette, G. Beaudoin, S. De Souza, O. Côté-Mantha i M. Simard. Ore mineralogy and mineral chemistry of the Whale Tail zone, Amaruq gold deposit, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326044.

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Abramov, B. N. PETROGEOCHEMISTRY, THE CONDITIONS OF FORMATION OF GRANITOIDS OF AMUDZHIKANSHAKHTAMINSKIY COMPLEX (J2-3) IN THE ORE FIELDS OF GOLD AND MOLYBDENUM ORE DEPOSITS, EAST-ERN TRANSBAIKALIA. LJournal, 2017. http://dx.doi.org/10.18411/2223-0831-2017-8-2-45-17.

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Corriveau, L., i E. G. Potter. Advancing exploration for iron oxide-copper-gold and affiliated deposits in Canada: context, scientific overview, outcomes, and impacts. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332495.

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Streszczenie:
The Geo-mapping for Energy and Minerals (GEM) and Targeted Geoscience Initiative (TGI) programs conducted extensive collaborative research on mineral systems with iron oxide-copper-gold (IOCG) and affiliated deposits in prospective settings of Canada. Regional alteration mapping as well as geochemical and geophysical modelling undertaken under the GEM program documented the evolution of polymetallic metasomatic systems with iron-oxide and alkali-calcic alteration and led to an increased recognition of the mineral potential of poorly explored areas and historic deposits of the Great Bear magmatic zone in the Northwest Territories, thus providing a solid framework for exploration. Early and barren albitite corridors form across the mineral systems and locally host uranium mineralization associated with telescoping of alteration facies by tectonic activity during the metasomatic growth of the systems. Subsequent to albitization, high-temperature Ca-Fe and Ca-K-Fe alteration form iron oxide-apatite (± rare-earth element) mineralization and IOCG variants rich in cobalt and other critical metals, respectively. Systems that further mature to K-Fe alteration form IOCG mineralization and can evolve to mineralized near-surface phyllic alteration and epithermal caps. Transitional facies also host polymetallic skarn mineralization. Rare-earth element enrichments within iron oxide-apatite zones are strongest where remobilization has occurred, particularly along deformation zones. The TGI projects documented the pertinence for a GEM activity in the Great Bear magmatic zone and subsequently synthesized GEM geoscientific data into a system-scale, ore-deposit model, and outlined criteria for mineral resource assessment. This model, and newly developed field-mapping and lithogeochemical tools were shown to be efficient mineral exploration and regional mapping methods in Canada and were also applied to the archetype IOCG deposit, Olympic Dam, and other deposits in the Olympic Cu-Au metallogenic province of Australia. Case examples also include the Romanet Horst in the Trans-Hudson Orogen (second phase of GEM), the Central Mineral Belt in Labrador (TGI), the Wanapitei Lake district in Ontario (private sector exploration results used by TGI), and the Bondy gneiss complex in Quebec (TGI).
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Lawley, C., B. Dubé, S. Jackson, Z. Yang, P. Mercier-Langevin i D. Vaillancourt. Sulfide paragenesis and LA-ICP-MS arsenopyrite geochemistry at the Meliadine Gold District, Nunavut: implications for Re-Os arsenopyrite geochronology and ore deposit genesis. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293938.

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